content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ------------------------------
   * PolynomialFunction2DTests.java
   * ------------------------------
   * (C) Copyright 2009, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 28-May-2009 : Version 1 (DG);
   *
   */
  
  package org.jfree.data.function;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutput;
  import java.io.ObjectOutputStream;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.fail;
  
  
  /**
   * Tests for the {@link PolynomialFunction2D} class.
   */
  public class PolynomialFunction2DTest  {
  
  
  
  
  
      /**
       * Some tests for the constructor.
       */
      @Test
      public void testConstructor() {
          PolynomialFunction2D f = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          assertArrayEquals(new double[]{1.0, 2.0}, f.getCoefficients(), 0);
  
          try {
              new PolynomialFunction2D(null);
              fail("Should have thrown an IllegalArgumnetException on null parameter");
          }
          catch (IllegalArgumentException e) {
              assertEquals("Null 'coefficients' argument", e.getMessage());
          }
      }
  
      /**
       * Some checks for the getCoefficients() method.
       */
      @Test
      public void testGetCoefficients() {
          PolynomialFunction2D f = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          double[] c = f.getCoefficients();
          assertArrayEquals(new double[]{1.0, 2.0}, c, 0);
  
          // make sure that modifying the returned array doesn't change the
          // function
          c[0] = 99.9;
          assertArrayEquals(new double[]{1.0, 2.0}, f.getCoefficients(), 0);
      }
  
      /**
       * Some checks for the getOrder() method.
       */
      @Test
      public void testGetOrder() {
          PolynomialFunction2D f = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          assertEquals(1, f.getOrder());
      }
  
      /**
       * For datasets, the equals() method just checks keys and values.
       */
      @Test
      public void testEquals() {
          PolynomialFunction2D f1 = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          PolynomialFunction2D f2 = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          assertEquals(f1, f2);
          f1 = new PolynomialFunction2D(new double[] {2.0, 3.0});
          assertFalse(f1.equals(f2));
          f2 = new PolynomialFunction2D(new double[] {2.0, 3.0});
          assertEquals(f1, f2);
      }
  
      /**
       * Serialize an instance, restore it, and check for equality.
       */
      @Test
      public void testSerialization() throws IOException, ClassNotFoundException {
          PolynomialFunction2D f1 = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
  
              ByteArrayOutputStream buffer = new ByteArrayOutputStream();
              ObjectOutput out = new ObjectOutputStream(buffer);
              out.writeObject(f1);
              out.close();
  
              ObjectInput in = new ObjectInputStream(new ByteArrayInputStream(
                      buffer.toByteArray()));
          PolynomialFunction2D f2 = (PolynomialFunction2D) in.readObject();
              in.close();
  
          assertEquals(f1, f2);
      }
  
      /**
       * Objects that are equal should have the same hash code otherwise FindBugs
       * will tell on us...
       */
      @Test
      public void testHashCode() {
          PolynomialFunction2D f1 = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          PolynomialFunction2D f2 = new PolynomialFunction2D(new double[] {1.0,
                  2.0});
          assertEquals(f1.hashCode(), f2.hashCode());
  
      }
  
  }
  
  